My brother bought a .308 when I bought my 30-06 and the difference between them killing Sambar is the same. As a loader I should have got a .308 as well because they use less powder, have a shorter action and do the same job. As for the .303, I have one and love it. I have shot fallow with it and it is great to handle. Factory ammo is a bit dear when compared to a .308 or 30-06 and bullet choice is limited. I put a Ramline synthetic stock on my 1917 BSA to drop the weight a bit but it still shoots 1" groups at 100m.

Dave